Cosmic's Custom Airbrush's award winning artwork and custom painting has been featured in numerous worldwide magazines spanning over three decades. Chopper, Biker, Easy Rider, VQ, Truckin, Lowrider, Mini Trucking and many more have featured vehicles painted by Cosmic's. Other trade magazines and local newspapers have also featured Cosmic's in addition to Dennis Mathewson as the featured artist; Sign Biz, Sign Painter, Art Scene International, Airbrush Action, Airbrush Step by Step, Pinstriping & Kustom Graphics, Airbrush Tech. Auto Art, Airbrush Free, Airbrush Magazine, Auto Graphics as well as local Hawaii newspapers and magazines.

Dennis Mathewson is also a freelance writer who has contributed dozens of articles on his artwork, step-by-step processes and airbrush industry tricks of the trade to worldwide publications over the years as well as in instructional videos. All of this has led to developing trade tools, Iwata Medea-Artool airbrush templates and his signature line of painting colors, Hawaiian Hues. More recently, his newest line of popular art frames, DM Dzign custom mouldings, are available and can be purchased in upscale framing shops as well as art and hobby shops. He is currently in the process of creating a book about his art.

Dennis Mathewson has been teaching and instructing the art of custom painting while traveling with custom hands on workshops, seminars and appearing at industry events worldwide, teaching his craft to 1000's for over 35 years.